JD
John Donovan — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this John Donovan across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents Martin & Mark — first a head (b.~1906), then head of a 3-person household.
Age 34
b. ~1906
Male
Head
Born: Illinois
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Donovan |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 34 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | conductor |
| Industry | city transportation |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1650 |
| Highest Grade | Hs 2 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Conductor |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1906 |
Household Members
Census records only state relationship to the household head.
Pairwise kinship is derived (~90–95% accurate), not recorded.
Step/blended families and boarders can break it.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Joan Donovan | Daughter | — | 4 | ~1936 |
| John Donovan | Head | — | 34 | ~1906 |
| Ruby Donovan | Spouse | — | 26 | ~1914 |
Census Appearances
1920
Cook, Illinois
Son, age 13
Cook, Illinois · implied b. ~1907 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Donovan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Texas |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Son, age 24
Cook, Illinois · implied b. ~1906 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Donovan |
| Given Name | John W. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Texas |
| Occupation | Motorman |
| Industry | Street Car |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Head, age 34
Cook-County, Illinois · implied b. ~1906 — 3 household members
| Surname | Donovan |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 34 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Occupation | conductor |
| Industry | city transportation |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1650 |
| Highest Grade | Hs 2 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
Model Tree
An inferred pedigree reconstructed from census links — up to 4 generations within the 1900–1950 window. Closer generations are built from household co-residence; deeper ones are bridged by following a relative to their own childhood census. Confidence compounds and weakens with each generation.
Our Model Tree links John Donovan across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Martin Donovan (~0.92 confidence) and father Mark Donovan (~0.92 confidence) and mother Augusta Donovan (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Martin Donovan
b. ~1878
Source father
● Household
· direct · ~0.92
Father
Mark Donovan
b. ~1879
Source father
● Household
· direct · ~0.92
Mother
Augusta Donovan
b. ~1886
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Donovan
Head · 1940 · age 34 · b. ~1906 · Illinois
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Cook-County, Illinois
Open full size
1940 US Federal Census — Cook-County, Illinois
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-00935-00180)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Julia Baggot | 71 | — | — | Illinois |
| 42 | Peter E Olsen | 62 | Head | Laborer | Sweden |
| 43 | Amelia Olsen | 60 | Wife | — | Sweden |
| 44 | Helen Olsen | 30 | Daughter | Typist | Illinois |
| 45 | Fred Anderson | 48 | Head | Fireman | Illinois |
| 46 | Mary Anderson | 49 | Wife | — | Illinois |
| 47 | Fred M Anderson | 17 | Son | — | Illinois |
| 48 | Amelia Anderson | 76 | Head | — | Sweden |
| 49 | David Blide | 26 | Head | — | Sweden |
| 50 | Ella Blide | 50 | Daughter | — | Illinois |
| 51 | Oliver Blide | 48 | Son | Office Clerk | Illinois |
| 52 | Ruben Blide | 46 | Son | — | Illinois |
| 53 | Leonard Elliott | 56 | Head | Manager | England |
| 54 | Mary Elliott | 64 | Wife | — | Ireland N |
| 55 | Catherine Ullman | 65 | Head | — | Eire |
| 56 | Thomas Ullman | 39 | Son | Attorney | Illinois |
| 57 | Patrick Ullman | 31 | Son | Attorney | Illinois |
| 58 | William Alsup | 50 | Head | Manager | Illinois |
| 59 | Beatrice Alsup | 49 | Wife | Sales Lady | Indiana |
| 60 | William M Alsup | 22 | Son | Printer | New Jersey |
| 61 | Whitley Elder | 36 | Head | Electrician | Louisiana |
| 62 | Marie Elder | 33 | Wife | Proprietor | Illinois |
| 63 | Dolores Elder | 15 | Daughter | — | Illinois |
| 64 | Dorothy Elder | 8 | Daughter | — | Indiana |
| 65 | Eugene Elder | 11 | Son | — | Illinois |
| 66 | Ben Levy | 53 | Head | Tailor | Poland |
| 67 | Ida Levy | 39 | Wife | — | New York |
| 68 | Shirley Levy | 17 | Daughter | — | Illinois |
| 69 | Rosalind Levy | 15 | Daughter | — | Illinois |
| 70 | Jean Levy | 13 | Daughter | — | Illinois |
| 71 | Doreen Levy | 10 | Daughter | — | Illinois |
| 72 | Marilyn Levy | 10 | Daughter | — | Illinois |
| 73 | Peder Forde | 35 | Head | Upholsterer | Norway |
| 74 | Greta Forde | 29 | Wife | — | Sweden |
| 75 | June Forde | 3 | Daughter | — | Illinois |
| 76 | Janet Forde | 1 | Daughter | — | Illinois |
| 77 | John Donovan THIS PERSON | 34 | Head | Conductor | Illinois |
| 78 | Ruby Donovan | 26 | Wife | Operator | Indiana |
| 79 | Joan Donovan | 4 | Daughter | — | Illinois |
Pedigree Summary
John
Gen 1 · 3 parents
~0.92
Max depth 4 (1900–1950 window)
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1940 United States Federal Census (NARA). Our Model Tree links this person across census decades using XGBoost-based record linkage, with per-link confidence scores. Household corroboration strengthens the signal when co-residents appear on the same census pages in multiple years.
Source: National Archives and Records Administration (NARA)